Global Patent Index - EP 0731094 B1

EP 0731094 B1 20000920 - Process for the preparation of pyrazoles

Title (en)

Process for the preparation of pyrazoles

Title (de)

Verfahren zur Herstellung von Pyrazolen

Title (fr)

Procédé pour la préparation de pyrazoles

Publication

EP 0731094 B1 20000920 (DE)

Application

EP 96102714 A 19960223

Priority

DE 19507915 A 19950307

Abstract (en)

[origin: EP0731094A1] Prodn. of pyrazoles of formula (I) comprises reacting a 3-alkoxy-2-propenylidene dialkyl ammonium chloride of formula (II) with a hydrazine cpd. of formula (III) in the presence of a base and opt. a diluent: R<1>-R<3> = alkyl; R = H, alkyl or opt. substd. cycloalkyl, aryl or aralkyl.

IPC 1-7

C07D 231/12

IPC 8 full level

C07D 231/12 (2006.01)

CPC (source: EP KR US)

C07D 231/12 (2013.01 - EP KR US)

Designated contracting state (EPC)

BE CH DE ES FR GB IT LI NL

DOCDB simple family (publication)

EP 0731094 A1 19960911; EP 0731094 B1 20000920; BR 9600932 A 19971230; CN 1137522 A 19961211; DE 19507915 A1 19960912; DE 59605900 D1 20001026; ES 2151615 T3 20010101; JP H08245595 A 19960924; KR 960034179 A 19961022; TW 342387 B 19981011; US 5606074 A 19970225

DOCDB simple family (application)

EP 96102714 A 19960223; BR 9600932 A 19960306; CN 96104112 A 19960306; DE 19507915 A 19950307; DE 59605900 T 19960223; ES 96102714 T 19960223; JP 6891696 A 19960301; KR 19960005601 A 19960304; TW 85101226 A 19960201; US 61077396 A 19960304